Troubleshooting Guide
CN-IC1-09
Title
:
i-Controller REV.200 Alarms (Troubleshooting)
EXTERNAL
5
1-19MAY2021
Compressor Proof Alarm
The compressor proof alarm is generated when a specific compressor is not running when enabled by the controller. If a
digital compressor is at 50% capacity and the discharge pressure minus suction pressure is less than 20psi, a compressor
proof alarm will be generated. If a fixed compressor is on and the discharge pressure minus suction pressure is less than
40psi a compressor proof alarm will be generated.
When a compressor proof failure is detected, “
No Comp Proof
” will be
displayed next to “
COMP
” on the
Alarms
screen.
When a successful proof signal is received by the controller, the compressor proof alarm will automatically reset.
Compressor Proof
Alarm Present
Compressor
contactor
Closed?
•
Check compressor operation
•
Check contactor operation
•
Check the refrigerant level
•
Check power to compressor
•
Check for airflow issues
(including dirty filter, dirty or
clogged evaporator coil etc.)
Yes
No
•
Check the controller to see if
compressor is being called ON
•
Verify the alarm input points
on the board or controller
•
Verify that program is set for
the correct number of
compressors
•
Check wiring and connections
Alarm cleared?
Contact Tech
Support
1-888-598-1198
No
Issue resolved
Check to see if
compressor is being
called ON
Yes
